What is the narrator point of view in the novel, Mrs. Bathurst?

The reader is told the story via the unnamed narrator. Yet, the central or core story of the relationship between Mr. Vickery and Mrs. Bathurst is revealed through the narration of Mr. Pyecroft and Sergeant Pritchard. Therefore, the reader's point of view about the central narrative is filtered through two other narratives, that of Mr. Pyecroft and that of the narrator himself, who speaks in the first person.